Coaster brake



faire OF PHILADELFHIA, PENNSYLVALTIA,

:i T T E S l CLARENCE` M. Davis-or CAPE NAY, .NEW JnRsnnAssI-GNCR To a. Ninoxr COMr'ANr,A f

A CORPORATION or rnNNsYLvANrA; i y.

PATENT reise. j

y COASTER BRAKE..`

To all 'au/tom t may Concern: Be it known that; I, CLARENCE M. DAVIS a citizenfof the United States, residing in Cape May city, New Jersey, have invented Coaster Brake`s,lof which the following is a specification. l Y j,

(.)ne'object of my invention is 'to provide a relatively simple, substantial and inexpensive form of coaster brake 'particularly adapted for use on bicycles, velocipedes, tricycles and otherv similar vehicles, which shall be' adapted to permit the forward driv ing of a wheel, shall allow coasting and shall include means whereby a'braking force may be applied vto the wheel'or the latterv may be driven backward atjwill.

l furtheifde'si're to provide a form of coaster brake whichshall utilize the fork of a vehicle as apart of a device for control-V ling the application of a brakingv forceto a rotary member such as a wheel.

Another object of my invention is to provide a coaster brake for a vehicle such as a bicycle or velocipede, which shall include a.

Figs. 3 and 4 are vertical sections takenl respectively on lines 3-3 and 4 4, Fig/1.

In the abovedrawingsjll represents the lower ends `of the fork of a vehicle such as a bicycle oifkvelocipede, which are connected at the' upper "endsfin. such manner andare made of such material that they are more or less springyand free to move t0- ward o'r-from each other toa limited extent. Each of these fork branches 1 is formed to provide a. bearing for-fthe cylindrical portion'2 lofaftubular crank spindle; 3, in the present,instance'formed integral with a crank arm 4 car'r ingat its outer or lfree endV a pedalhw'hic' yas `it forms no part of f the present'1nvention,has not been illussiiecificatipn of Letters Patent. i

Patented' J an. 3',r 191272;

`Appiicafion filed August 4, 1921. serial No. 489,719.

.trated.` Each of said'tubular spindles 3 has its inner end 5 'squared or otherwiseformed wlth a polygonal outline and on thisl'poa.

lygonal end ismounted a clutch member -6 1n the form of a short cylinder having an annular recess 7, concentric with the crank spindles 3. Said members abut up'onfshouL ders-12a between they parts 2' and 5 of said sp1ndles,' which have extending yaxially through them a shaft or spindle 8 having a head 9 on one end and a plate or washer 10 held non-rotatably to the opposite end by a nutll. The faces of the head and ylof thenut adjacent theends ofthe crank spindles 3 areeach formed in'tw'o parts at an obtuse angle to each other and constitute cams which coact with similarly formed angularY depressions in the ends of said spindles.

These are slidable on the shaft `8 and, asV hereafter set forth, are free to turn thereon to a limited extent. l i

lThe outer ends of the crank spindles immediately adjacent the outer faces of the bearing portions` of the forkbranches 1` have shouldersY 12 which press against said branches and force them toward each other, when owing to their coaction with the cam faces of the head 9 and nut 10, said crank spindlesV are moved toward each other. The

`fork branches 1, as well as the clutchmembers 6, are both longitudinally slidable upon their respective crank 'spindles and' each of said'clutchmembers has aj'at inner face designed tofr'ictionally engage the adjacent fiat outer face'of.- the flange 13 of a wheel hub 14. This i'srotatably mountedon the shaft 8 between said members, and its flanges 13` serve for the attachment of the inner ends of spokes 15 whose outer ends are connected tov or associated with the rim ofthe wheel in any desired manner forming no partvof the present invention.

In each of fthe annular recesses 7 ofthe clutch members is mounted a second clutch member in the formof a cambloc'k 16 forming part of or connected to acurved arm 17 lying between the vhub of Ythe clutch memioo ber 6 and the hub flange 13' and terminating in a transversely projecting lug 18 more or less loosely extending into,` aV hole formed in said flange about 180o distantv from said cam '16. lThe latter is so formed that when the pedalcranks 4 are turned in a clockwise direction; the clutch members 6 are likewise turned and the arms 17 with saidcams are caused to swing on the lugs 18 as pivots whereupon they frictionally grip or jamY betweenfthevinnerand'outci Walls of their-l recesses lT,-tl1us connecting` said clutch mem-y bers to the hub flanges 13 so that the Wheel is likewise turned in a clockwise direction.

' If the pedal cranks are no longer posi-V tively turned but arealloivcdto remain idle,Y

the continued foi-Ward .movement of the wheel Vwith the hub lll acts on the lugs 18 and arms 17 to .free the cams 16 from gripping engagement with the clutch -members 6, so that the Wheel, .and therefore the vehicle Vof which itforms a part; is free to drift or coast'independently of the lpedal Y cranks.

` with the spoke flanges 13 of the Wheel. Ob Vviously themagnitude of the braking force applied to thewheel is `*dependent 4upon'the Vf orce applied to turn back one 'of the .crank Varms While .thel other is held from turning t If now one' of these latter is held While the other is turned backwardly, the cam faces of the head 9 and nut 10 coact vwith the adjacent portions of the crank spindle ends so that theseare moved toward each other and move together the lower ends ofthe fork branches l as well as 'force the adjacent clutch members 6 into frictional engagement and ifv desired this force may be continued `and increased to such an extent that .the Wheel may bestopped and positively driven backward.

Upon the removal ofthe force tending to rotate one of the crank spindles relatively to the other; the natural resiliency of the l fork branches 1 causes these to vspring apart 40 i toptheir normal positions and carry 'with them said spindles and cranks; whereupon the clutchY members 6 are no longergfrictiona-lly pressed against the hub flanges 13.

' so that the Wheel is free to coast or drift and 'tiveconditionfor long periods oftime. l

In order toprevent sudden gripping ofthe parts 6 and 13 -and to insure the .gradual application Aof the braking .force to the Wheel,r y-may if desired provide annular grooves in the adiacentwfaces of each .of theanges of the'members vand of its COacting hub ange ingrbrake ring 20. As a result of this constructionthere is no danger of the clutch elements immovably gripping the hub .flanges or of their alternately gripping and rele-asingvthem as might otherwise occur., y l claim: t

. 1. The combination in a coaster brake of affork; a crank shaft; cranks having tubular spindles journaled in said fork and freeto turn aswell as slide longitudinally on said shaft; a `Wheelhub; braking means therefor actuated by relative longitudinal Vmovement I of the spindles on the crank shaft.

2. The combination in a coasterbrake of a fork; a crankshaft; vcranks having tubularfspindles liouinaled insaid fork and free to turnas .Well as slide longitudinally on said shaft; a Wheel hub; a braking member lcooperative With the hub; and means actuated by relative movement ofthe crank spindles for-causing said member ,to retard movement of the hub, 1 Y d 3. "fl`hecombiuation inla coaster brake of a fork: a crank shaft; `cranks havingr tubular spindles journaled in said fork and free to turn as. Well ascslide Vlongitudinallye on said shaft; a wheel hub; aclutch fori-connecting the hub and lthe spindles when the latter arev turned in one direction; and Vmeans for causing a ,portion ofthe clutch Ato act as a brake for the hub WhenV one of the; lspindles Vis Vturned relatively to the other. y

4. The combination in la.coasterbrake of al fork; tubular spindles journaledy insaid fork; cranks respectively connected tosaid spindles; a. crank shaft Vextending through'- tlie tubular spindles and having cams thereon for causing movement of said spindles toward eachother when they areturned relatively to the shaft; a hub mounted to rotate on the shaft.; clutching means for connecting the spindles lto the liu-b when the cranks are turnedijn one direction; Awith braking meansV operative on the hub and actuated by relative longitudinal movement of the crank spindles.

5. The combination in a coaster brake o fa iiok fork; tubular. spindles journaledin said fork; cranks respectively connected to said spindles; a crankshaft extending through the 4tubular spindles and having cams thereon forcausing movement of said `spindles toward each other When they. are turned relatively to the shaft; a; hub mounted to rotate on the shaft; with means for utilizing the resiliencyV of the fork to release 'the braking means. l v Y r l,6., Thecombination inra coaster brakel o fa fork; cranks having tubular'spindles journaled therein; a crank shaft having cams on its ends coacting withY the crank spindles to cause their relativelongitudinal movement :l

when one of them is turned relatively to other ahub on the crank shaft.; and two clutcheseperativeon the sides of .the hub to connect the same to the crank spindles When the cranks are turned in one direction.

7. The combination in a coaster brake of a fork; cranks having tubular spindles jour naled in the Ibranches of said fork; a' crank shaft extending through said spindles; a hub rotatably mounted on the crank shaft; clutch members xed to the crank spindles; other` clutch members connected to the hub and formed to clutch said first members respectively When the cranks are turned in one direction; and means for causing the crank spindles to move together to cause the first clutch members to retard rotation' of the hub when one of the cranks is turned on the shaft relatively to the other.

8. The combination in a coaster brake of a fork; cranks having tubular spindles `iournaled in the branches of said fork; a crank shaft extending` through said spindles; a hub rotatably mounted on the crank shaft; clutch members fixed to the crank spindles; other clutch members connected to the hub and formed to clutch said first members respectively When the cranks are turned in' one direction; means for causing' the crank spindles to move together to cause the first clutch members to retard rotationof the hub when one of the cranks is turned on the shaft relatively to the other; and means for causing the branches of the forks to oppose movement together of the crank spindles.

9. The combination in a coaster brake'of a fork; vcranks having tubular Vspindles rotatably mounted in the branches of the fork and formed with shoulders adjacent the outer sides of'said branches; clutch members rotatably. fixed to the crank spindles; a crank shaft extending through the spindles and having cams on its ends cooperative With the spindles for causing them to move longitudinally on said shaft when one of them is turned relatively to the other; a Wheel hub mounted on the shaft between the clutch members and having flanges cooperating` with said members to form braking means; with elements for connecting said clutch members respectively to the hub When the cranks are turned in one direction.

l0. The combination in a `coaster brake of affork; cranks having tubular spindles rotatably mounted in the branches of the fork and formed with shoulders adjacent the outer sides of said branches; clutch members rotatably fixed to the crank spindles;

a crank shaft extending through the spindles and havingl cams on its end cooperative with the spindles for causing them to move longitudinally on said shaft when one of them is turned relatively to -the other; a Wheel hub mounted on the shaft between the clutchmembers and having fianges cooperating With said members to form braking means; With elements for connecting said clutch members respectively to the hub When the cranks are turned in one direction, the branches of the fork cooperating with the shoulders of the crank spindles to move the clutch members -aivay from the hub flanges after they have been forced into braking engagement therewith.

ll. The combination ina coaster brake of a fork; a crank shaft; cranks'having tubular spindles journaled in said fork and free to turn as Well as slide longitudinally on said shaft; a Wheel hub; a clutch including a member mounted'adjacent said hub; and a turn Well as slide longitudinally on said Y shaft; a Wheel hub; With braking means including a member movable toward the hub by relative longitudinal movement of the spindles on the shaft and including a floating ring between said member and said hub.

cnknnncn M. Davis. 

